单项选择题

It is difficult for her to make the final decision now,()she is in a delicate situation.

A．if
B．unless
C．until
D．since

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单项选择题

There is a man at the reception desk who seems very angry and I think he means () trouble.

A．making
B．to make
C．to have made
D．having made

单项选择题

Hellen is fond of light music, ()her brother is keen on rock and roll.

A．when
B．and
C．while
D．for

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